Cave painting from Tadrart Acacus (Acacus Mountains) in the desert of western Libya, a UNESCO World Heritage Site. (Source: "http://en.wikipedia.org/wiki/File:Tadrart_Acacus_1.jpg")
A Yin-Yang symbol transformed into Heaven and Earth, with the Chinese characters for each. Because Heaven is Yang, and Earth is Yin. Hope you enjoy it.